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Method and device for turbo equalization and its inter-frame and intra-frame correlation prediction
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A prediction method and predictor technology, applied to the shaping network, transmission system, electrical components, etc. System performance, effect of improving decoding performance
Active Publication Date: 2018-04-06
ZTE CORP
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[0004] However, it is noted that when the channel decoder of the existing Turbo equalizer is a linear convolutional code, there is no prior knowledge about the source bits. During Turbo equalization, the channel decoder cannot fully reflect the Turbo idea, which also affects system performance
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Embodiment 2
[0254] This embodiment provides an inter-frame correlation prediction method in channel decoding that can be the same as Embodiment 1, such as Figure 4 shown, including:
[0255] Step 210, according to the channel decoding results of the current frame and the previous frame, determine the value of the changed bit of the current frame;
[0256] In this step, the change bits of each source bit of this frame can be calculated according to the following formula according to the source bits obtained by channel decoding of this frame and the previous frame:
[0257] c k，q =xor(u k，q , uk-1，q )
[0258] Among them, c k，q is the qth changed bit in the kth frame, xor(x, y) is the XOR of bits x, y, u k，q , u k-1，q are the qth bit in the source bits of the kth frame and the k-1th frame, respectively.
[0259] above c k，q The simplified algorithm only needs to provide u k，q That is, the hard judgment result can greatly simplify the complexity of the channel decoder.
[0260] In...
Embodiment 3
[0281] This embodiment provides an intra-frame correlation prediction method in channel decoding, which may be the same as Embodiment 1, wherein, when performing channel decoding on a frame of data, each iteration calculates the prior soft information of the relevant bit pairs in the following manner :
[0282] Step 310, performing a weighted operation on the historical value and current value of the array recording the number of occurrences of each value combination of the relevant bit pair to obtain the value of the array in this iteration, wherein the current value of the array is decoded according to the channel The soft information of the relevant bit pair output by the device in this iteration is determined, and the historical value of the array is the value of the array obtained in the previous iteration.
[0283] Assuming (a, b) constitutes a relevant bit pair, there are four combinations of their values, respectively s0=(0,0), s1=(0,1), s2=(1,0), s3 =(1,1). Use s_ar...
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Abstract
A method and device for turbo equalization and its inter-frame and intra-frame correlation prediction, the turbo equalization method includes: performing channel decoding according to the equalized soft information after deinterleaving, outputting soft information of source bits and channel coding output bits The soft information of the sequence; wherein: when performing the channel decoding, in the first iteration, the prior knowledge of the source bits of the frame obtained by the inter-frame correlation prediction is also used to perform the decoding operation, and / or, in addition to the first iteration In other iterations, the prior knowledge of the source bits of the frame obtained by intra-frame correlation prediction is also used to perform decoding operations. The invention also discloses an inter-frame correlation prediction method and an intra-frame correlation prediction method in channel decoding, as well as a corresponding inter-frame correlation predictor and an intra-frame correlation predictor. The above scheme improves the inter-frame correlation prediction method and the intra-frame correlation prediction method and applies them to Turbo equalization, improving the decoding performance of the channel decoder.
Description
technical field [0001] The present invention relates to a wirelesscommunication reception, in particular to a method and device for Turbo equalization and its inter-frame and intra-frame correlation prediction. Background technique [0002] Wireless signals often suffer from multipath fading during transmission. At this time, in order to estimate the transmitted signal, it is necessary to use an equalizer to perform an equalization operation to compensate for inter-symbol interference caused by multipath transmission. Usually the equalizer only uses the received signal and thinks that the transmitted symbols are equally distributed in the transmitted symbol set. If the prior probability of the transmitted symbol that is closest to the transmission process can be obtained at this time, the posterior probability can be fully utilized in the equalizer. The probability maximization method obtains the posterior probability of the transmitted bit sequence, and converts the poster...
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